code: def _should_cache(req: ray_client_pb2.DataRequest) -> bool:
      """
      Returns True if the response should to the given request should be cached,
      false otherwise. At the moment the only requests we do not cache are:
          - asynchronous gets: These arrive out of order. Skipping caching here
              is fine, since repeating an async get is idempotent
          - acks: Repeating acks is idempotent
          - clean up requests: Also idempotent, and client has likely already
               wrapped up the data connection by this point.
          - puts: We should only cache when we receive the final chunk, since
               any earlier chunks won't generate a response
          - tasks: We should only cache when we receive the final chunk,
               since any earlier chunks won't generate a response
      """
      req_type = req.WhichOneof("type")
      if req_type == "get" and req.get.asynchronous:
          return False
      if req_type == "put":
          return req.put.chunk_id == req.put.total_chunks - 1
      if req_type == "task":
          return req.task.chunk_id == req.task.total_chunks - 1
      return req_type not in ("acknowledge", "connection_cleanup")
  
imports: from collections import defaultdict
  from ray.util.client.server.server_pickler import loads_from_client
  import ray
  import logging
  import grpc
  from queue import Queue
  import sys
  from typing import Any, Dict, Iterator, TYPE_CHECKING, Union
  from threading import Event, Lock, Thread
  import time
  import ray.core.generated.ray_client_pb2
  import ray.core.generated.ray_client_pb2_grpc
  from ray.util.client.common import CLIENT_SERVER_MAX_THREADS, _propagate_error_in_context, OrderedResponseCache
  from ray.util.client import CURRENT_PROTOCOL_VERSION
  from ray.util.debug import log_once
  from ray._private.client_mode_hook import disable_client_hook
label_desc: Use image node_id 2 for calling a global function with example usage: _should_cache(req) and returns: unknown, False, unknown, unknown